1: diphenylphosphine oxide With cupric triflate; 1,1,3,3-tetramethyldisiloxane in toluene T=100°C; 9 h; Inert atmosphere; 2: With cesium hydroxide monohydrate in N,N-dimethyl-formamide; toluene T=20°C; 1 h; Inert atmosphereMolecular sieve; 3: 1,2-bis-(bromomethyl)benzene in N,N-dimethyl-formamide; toluene T=100°C; 24 h; Inert atmosphereMolecular sieve;

in tetrahydrofuran T=20°C;

ammonia; sodium; ammonium chloride 1) 30 min., 2) 2 h; Yield given. Multistep reaction;

in tetrahydrofuran 0.5 h; Heating; Yield given;